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  • Which cell will measure standard electrode potential of copper electrode ?

Which cell will measure standard electrode potential of copper electrode?

(i) \; Pt (s)| H_{2}(g,0.1 bar)| H^+ (aq.,1 M)|| Cu^{2+}(aq.,1M) |Cu

(ii) \; Pt (s) |H_{2}(g,1 bar) |H^+ (aq.,1 M)|| Cu^{+2}(aq.,2M)| Cu

(iii) \; Pt (s) | H_{2}(g,1 bar)| H^+ (aq.,1 M) || Cu^{2+}(aq.,1M) |Cu

(iv) \; Pt (s) |H_{2}(g,1 bar) |H^+ (aq.,0.1 M) ||Cu^{2+}(aq.,1M)| Cu

 

Answers (1)

The answer is the option (iii) On connecting copper electrode to standard hydrogen electrode, it acts as cathode and its standard electrode potential can be measured.

E^{0}=E_{R}^{0}-E_L^0=E_R^0-0=E_R^0

Pt (s)\left | H_{2}(g,1\; bar) \right |H^{+}(aq., 1 M)\parallel Cu^{2+}(aq., 1\; M)\mid Cu

will measure standard electrode potential of copper electrode.
 The standard electrode potential is measured for a given cell by coupling it with the standard hydrogen electrode where pressure of hydrogen gas is maintained at one bar. Concentration of the H+ ion in the solution is one molar and so is the concentration of the oxidized and reduced forms of the species.

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